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H. E. YARROW.

HEAT INSULATION OF THE STEAM GENERATING APPARATUS 0F SUBMARINE VESSELS.

APPLICATION FILED MAY], 1911.

1 ,3 1 6,405 Patented Sept. 16, 1919.

4 SHEETS-SHEET 1.

1' COLUMBIA PLANOCIRAPH c0., WASHINGTON. n. c.

H. E. YARROW.

HEAT INSULATION OF THE STEAM GENERATING APPARATUS 0F SUBMARINE VESSELS.

APPLICATION FILED MAY 7. 1917.

1,316,405. Patented .16- 9;

4 SH SHEE 1 Naomi-lien; WASNINIXTON, I; c. v

, H. E. YARROW, HEAT INSULATION OF THE STEAM GENERATING APPARATUS 0F SUBMARINE VESSELS.

APPLICATION FILED MAY 7. IBM.

1,316,405. PatentedSept. 16,1919.

4 SHEETSSHEET 3.

e H. E. YARROW.

HEAT INSULATION OF THE STEAM GENERATING APPARA OF SUBMARINE VESSELS.

APPLICAUON FILED MAY 7. I

1,3 1 6,405 Patented Sept. 16, 9.

EET$SHFE I mz els 6 e '5 27206241502 f HAROLD EDGAR YARROW, OF SQO'ISIIIOUIT, GLASGOW, SCOTLANI).

HEAT INSULATION" 0E STEAMGENERATING- APPARATUS 0F SUBMARINE VESSELS.

Specification of Letters Patent.

Patented Sept. 16, 1919.

Application filed May 7, 1917. Serial No. 167,041.

To all whom it may concern:

Be it known that I, HAROLD EDGAR YAR- now, a subject of the Kin of Great Britain, residing at Scotstoun, (Ilasgow, Scotland, have invented new and useful Improvements Relating to the Heat Insulation of the Steam-Generating Apparatus of Submarine Vessels, of which the following is a=specification.

When a submarine vessel propelled on the surface by steam is submerged and the boilers are shut down, there is a large quantity of heat stored up in the boiler itself and in the highly heated brickwork for which there are no ready means of dissipation and which may form a source of extreme discomfort to the crew.

According to the present invention, this heat is prevented from escaping from the boiler and diffusing throughout the vessel by means of an outer casing surrounding the steam generating apparatus. The heat is rapidly dissipated by causing the air to circulate between the casing and the boiler and to pass at some part of its circuit through a cooling device of well known type, where the heat is rapidly abstracted by a flow of sea water, or other cooling agent, and is conveyed outside the vessel. The arrangement may be such that the circulation of the air only takes place in a compartment adjoining the boiler, which is highly heated.

In the accompanying drawings, various dispositions of the casing, I cooling device and means for circulating the air are shown, as applied for example, to a Yarrow water tube boiler. Figures 1, 2, 3, 4: are vertical cross sections through the boiler; Figs. 1 2 and 3 are corresponding sectional side elevations of the installation;.Fig. 46* is a sectional plan of the casing, and Fig. 5 a vertical cross section showing the position of the cooling device.

In all the figures similar parts are denoted by the same letters of reference.

In Figs. 1 and 1 a is the steam drum; 6 b are water pockets; 0 c superheater drums, which may or may not be provided; d is the uptake and boiler casing; e the brick-pan; f f steam generating tubes; 9 an air casing for the oil burners. In the example shown, an air casing Z completely surrounds the boiler, the boiler mountings and the oil sprayers, but the invention is not restricted to the disposition of the casing as shown; for instance, the boiler mountings, or the oil spraying apparatus, or both, may be outside the casing. In the example shown. thecasing is continued at m below the brickpan 6, so as to insulate and cool the incandescent bricks lining the pen. I 7

-At any convenient positions in the casing are disposed a fan 79- for circulating the air and a device 9 for cooling the air. T he path of the circulating air is shown by the-arrows; it enters the fan 10 by the intake 0,

traverses the'cooling device 9, passes down the trunk 11, and through openings 8, s to the lower parts of the boiler, rises to the upper part of the boiler and flows around the steam drum and uptake to the fan inlet 0.

The cooling device 9 may comprise tubes traversed by the cooling medium, or conversely, the air may traverse tubes surrounded by the medium. The circulation of the medium may be elfected in any suitable known manner by a pump or by convection. The cooling medium may be seawater, or other liquid artificially cooled, or the air may be cooled by passing over ice.

A diaphragm or baffle plate 7' causes the current of air to follow the path described. Sliding doors such as 70 k may be provided to give access to the boiler mountings and oil sprayers or other parts, when the vessel is under steam.

It is obvious that the direction of circulation of the air may be opposite to that shown.

In the modification shown in Figs. 2 and 2% two circulating fans 10 are shown driven I by motors z. The water pockets 1) b are shown lagged and this lagging may be extended to other parts of the boiler.

In the modification shown in Figs. 3 and 3, a fan 11 usually provided for the employment of forced draft, is utilized to circulate the air between the casing Z and the boiler. As shown, a steam motor w and an electric motor a are provided as alternative means for driving the fan, but one of these might be omitted. The air is cooled by the device 9, as in the previously described constructions. By suitably arranged doors and shutters, the suction for the fan may be either from the open air or from the casing Z and the delivery may be either into the stoke-hold or into the casing.

In the arrangement shown in Figs. 4: and 4*, the cooling device 9 is placed in one of the ballast tanks 25 and is maintained at a low temperature by the surrounding water. The air is drawn from the casing Z by the fan 39 through the inlet 0, delivered to the cooler g by the duct 1), and returned again to the casing by the duct 10.

In Fig. 5, the cooling device 9 is placed in the inner hull, but the cooling water is supplied from the ballast tank If through the inlet pipe 71 and delivered to the tank through the delivery pipe 2' In this arrangement, when the vessel is on the surface and the ballast tank consequently empty the cooling device 9 is automatically drained.

Having thus described my invention and the best means I know for carrying the same into practical efli'ect, I claim 1. In a submersible vessel, the combination, with a boiler; of a casing surrounding said boiler; means for drawing air through the casing; and means for coolingthe air drawn through said casing.

2. In a submersible vessel, the combination, with a boiler; of a casing surrounding said boiler; a fan for drawing air through the casing;,and pipes arranged in the path 0]: the air current traversing said casing for cooling the air.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

HAROLD EDGAR YARROW.

Witnesses JAMES RITCHIE. CHRIsSIE W. WATSON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. 0. 

